The section of magazine e-mail or post

e-mail:Most e-mail accounts hold about 200000 email. But a lot of energy is needed to keep them in large servers. Companies like microsoft need air-conditionating to keep these machines cold.
Post: The worlds postal services- buildings, planes, trains, buses, etc- generate ea lots of Co2 (Carbon Dioxide). A letter sent from new york to new zeland travels 14700 km in plane. Than means that 1560kg of Co2 is realesed into the air. That's a lot!
In my opinion is best send an E-mail becouse it's instantant.